Tube chamfering tool



Jan. 16, 1940. F. G. BROWN 2,187,221 Q TUBE CHAMFERING Tooi.

Fi led March 2a, 1958 3nventor Frank G. Brown Gttorneg tubular openings. I l

An object ofthei nventionis toprovide a cham- Patented I 1 nhpplicationMarch-rzil, 1938, Serial No. 1 98,455 }11 Claims. loin-114a j M This to chamfering tools, and

l particularly tools,forfchamfering tubes,'rods, or

-fering tool, Whiohwillcut to-azdepth determined y thepressure under which the tool engaged ,withthe work. I I

Another objectis to provide a chamferin g tool,

thercutter of which maybe adjusted to m mine the. maximum depth of cut. o

, A further object is to provide agchamfering tool,

predeter- Which will be accurately self-centering and: will beadaptedto produceannular cham'fers of widely @varying diameters.: ,,s I

by the construction.hereinafter described and illustrated'in the accompanying drawing, wherein:

I Alliig. 1 is atop plan viewbfthe tool as designed to produce interior annularchamiers, the parts 1 being disposed to establisha non-cutting position of the blade. o

Fig. .2 is anendview of the same.

Fig. 3 is a side, elevational view of the same,

showing the parts disposed to position theblade fora maximum cut.1

l the line 4-4 of Fig.3. I; t I, M

, Fig. 5 is a perspective view of the cutting blade and a head carryinglthesame.

3 nates a disk-shaped head, splined or otherwise respectively projecting rearwardlyand forwardly engageable with any suitable driving member,

blade driving and guarding pilot member, 4 I formed withan axial, forwardlyextendingblind slidably fitting in a radial groove extending] from thetool atthe sameangleastheconicalface of the pilot member; said edgeybeing substantially; flush with the coned ,faoeot said member when the head I and bladeuareretracted as in Figs. 1 and 2, and predeterminedly projecting beyond such face whenthe head andpilot member are abutting, as inf-figs. 3;and 4. A drive-transmitting lug 8 rearwardly projecting from the pilot I 40 member has asliding fltin a radial groove 9 These and variouslother objects are attained.

Fig. 4 is asectionalviewoi thetool, takenon In these views, the reference character, I desigfixed upon a shaft'comprising portions 2 and 3,-

from said head. The portion 2 serves as a shank,

not shown. The portionw3, which is preferably. of lesser diameter, slidably mountsa. conical,

socket 5 to receive the shaft. The angleiformed between theaxis andconed face of the member 4 is predeterminedlyjequal to, the angleof the" chamfer whichthetool is designedto produce. 1 Thehead I is"radiallygrooved tosnuglyaccom-m .modate the rear end portion; of aficutting blade 6, rigidly securedin said, groove by a set screw 1. 1 I The blade projects iorwardly from the head substantially tothe' front end of the pilot member,

end toendofsuch member. The cutting edge I So of thebladeisconverged toward the axis of g accommodating the blade. A screw NIII tapped into thelug 8 has a head seating against the rear -i'aoe of suchlug and laterally projecting beyond the latter to act as a stop engageable with the rear iace of the head I to limit separativetravel or theheadj: and pilot member. A plurality of coiled springs II setinto sockets @I2of the pilot member exert athruston. the head I tending to maintain a maximum retraction of thehead and blade, with respect to theypilot member, as per Fig. 1.: Atone side of the blade, and in proximity to itscutting edge, the pilot member is cutaway from end to end thereof, as indicated at l3, to

afford adequate clearance for cuttings. In Fig. I 3there is sectionally shown at I4 a tube positioned to receive a chamfering out. o M

Influserof the describedtool, the shank ,2 is engaged by any suitable rotatable driving member, which may be either power driven or manually actuable. The pilot member is engaged in the opening of atube or other opening, abutting thezedge to be chamfered. While being rotatively, driven, the tool is subjected ,to a gradual forward feed. ,Since the pilot member cannot respond to such feed, being restrained by the work, the head I movesforward, compressing the springs II and advancing the blade. Such advance efiects' a tprojeotion of the cutting edge-beyond the coned 3 face of thepilot member, and renders such edge peripherally opening in the head I, said groove being preferably diametrically opposed to that efiectiveon the work, Obviously, aheavy ora light out may be taken according to the forward pressureapplied at the shank 2. Themaximum cut is achieved when the head I is abutted against the pilot member. In case it is desired either to increase this maximum or compensate for wear of the cutting edge 6a, the set screw! may be loosened and again tightened after shifting the "blade suitably fOIWflldr,

, As compared? to prior tools fora like purpose,

the described construction presents variousad-' vantages; Controlling the depth of cutby merely *regulatingthe applied forward pressure, eliminates necessity for adjustment in adapting the tool to metals, or other materials of different 1 hardness. In H correspondingly I chamfering a quantity of similar tubes, the advance of the; head 2 withyrespect to: the pilot member may, serve to indioate completion of a desired chamfer, and the blade may be initially set so that abutment of the head 2 against the pilot member will indicate a completed chamfer,

member asto protest it against rough usage. Re-

action ojfu jthe blade ,to a cutting operation ,is

transmitted tothe pilot member in such prox- When not in use, the blade is so withdrawn into the pil t,

imity tothe cutting edge as to minimize stresses ji'n theblade and eliminate any chattering or vibration of the blade. In other words, the pilot member applies a drive to the blade substantially throughout the blade length and in close proximity to the cutting edge.

While the illustrated tool is equipped with a single blade, it is obvious that a plurality of blades'might be provided, without change of principle. It is further evident that a pilot memch amfer, a pilot member for the tool forming her having an interiorly coned surfacemay be equipped with a blade adapted to project beyond such surface for producing an exterior annular chamfer, just as an interior'chamfer is produced by the described tool.

The invention is presented as including all such modifications. and changes as come within the siredfangleof ichamfer, a .driving member for' the blade, having a work-abutting surface converged toward said axis in substantially the same angular relation thereto as the cutting edge of .the blade, the-blade. beingslidable on such driving member along said axis to variably expose;

ing member. and effective on the blade to advance it forwardly on the blade-driving member'andlefiecta desired exposure of its cutting edge.

2. .-A rotary chamfering tool comprising ahead fer, a pilot and. driving member for the blade carried byand slidable to andfromsaid head and forming auguard for said cutting edge, andadapted to increase or diminish the effective exposure.of.. suchedge according as it is slid toward or from the. head, means yieldably urging the headand pilot member separatively, and means limiting separative travel of the head and pilot member.

3. A chamfering tool asset forth in claim 2, said'pilotmember being of a substantiallyconical form, its angularity to the tool axis substaning the cutter to be adjusted to vary the extent tially equalizing that of said cuttingedge to such axis.

' 4. In a chamfering toolas-setforth in claim 2,

means securing the cutter to said head, adaptof its projection from thehead.

a member projecting from said head along the .axisof the. tool and slidably mounting the pilot member.

beriand rigidly carried by one thereof -6. In a chamfering tool as set forth in claim 2,

a .memberdisposed at the axis of the tool and 7. A,chamfering tool as set forth in claim '2,

'a lug establishing, a. rotary drive from the head to the pilot member rigidly projecting from. one

thereof in the direction of sliding travel of the pilot member and slidably engaging the other,

said limiting means being carried by such lug.

8. A rotary chamfering tool comprising a head adapted to be rotatively driven, a cutter secured to such head and projecting therefrom substantially along the axis of rotation of the tool, said cutter having a cutting edge converged substantially toward said axis at a desired angle of also a guard for said cutting edge, an element mounting the pilot member on the head rigidly 7 carried by one thereof and slidably engaging the other, said'element being disposed at the axis of the tool, amember establishing a drive from said head to the pilot member, rigidly carried by the outer portion of the pilot member and slidably engaging. the head, means carriedby the last named member limitingseparative travel of the head and pilot member, and means yieldably urgingthe pilot. member and head separatively.

9. A rotary chamfering tool comprising an approximately conical pilot member, having its apex forming the front end of thetool, a cutter set into ,said pilot member, with its cutting edge converged substantially toward. the axis of the tool at substantially'the same angle as. the conical fajceofthe pilot member, a head disposed rearwardly of the. pilot member, and adapted to be rotatively driven, means securing therear end portion of the cutter to such head, a forward projection; on the, head at the'tool axis. slidably mounting the pilot member for movement to and from the.head,.a lug rigidly carried by and rearwardly projecting from the pilot member and slidingly fitted in the head to establish a rotary driVefr m-the head. to the pilot member, means carried by such lug for limiting separative travel of the head andpilotmember, and spring means reacting between the head and pilot member and urging them separatively.

10. A rotary chamfering tool comprising a head adapted-to, be, rotatively driven, a. cutter mounted on such head and projecting forwardly therefromandhavinga cutting edge converged substantially toward such axis at a desired angle of chamfer, a driving member for the cutter carfrom thehead, means. yieldably urging the head and driving member separatively, means limiting separative travel of the. head and driving member, and. means securing the blade tothe head affording-.the blade a forward adjustment on the head.

11. A rotary chamfering tool comprising a head adapted tQ-be rotatively driven, a blade-secured to..suchhead and projecting forwardly therefrom, a driving member for the blade mounted forwardly of thehea-d, the blade having a cutting edge converged substantially toward the axis of rotation of the tool, andthe driving member having asurface adjacent said edge correspondingly converged, means supporting the driving member on the head, affording such'member sliding travel to and from the head, means'for transmittinga driveto thedriving member in all positions of such; slidin travel, spring means interposed between the head and driving member urging the driving member forwardly, and means limiting travel of the driving member forwardly from the head. v

G; BROWN. 

